CN112121550A - Dust cleaning method and device for bag type dust collector - Google Patents
Dust cleaning method and device for bag type dust collector Download PDFInfo
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- CN112121550A CN112121550A CN202011116248.6A CN202011116248A CN112121550A CN 112121550 A CN112121550 A CN 112121550A CN 202011116248 A CN202011116248 A CN 202011116248A CN 112121550 A CN112121550 A CN 112121550A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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Abstract
The invention discloses a dust cleaning method and a dust cleaning device of a bag type dust collector, wherein the dust cleaning method of the bag type dust collector comprises the following steps: detecting the flue gas inlet pipe pressure and the flue gas outlet pipe pressure of the bag type dust collector and the frequency of an induced draft fan; determining a dust cleaning stopping differential pressure range and a dust cleaning starting differential pressure range according to the frequency of the induced draft fan; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the range of the ash removal stopping pressure difference, stopping ash removal; and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, starting ash removal. The ash removal method of the bag type dust collector avoids the situation of excessive ash removal or insufficient ash removal; and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are associated with the frequency of the induced draft fan, so that the accuracy of the ash removal stopping differential pressure range and the ash removal starting differential pressure range is improved, the ash removal effect is improved, and the condition of excessive ash removal or insufficient ash removal is further avoided.
Description
Technical Field
The invention relates to the technical field of bag type dust collectors, in particular to a dust cleaning method and a dust cleaning device of a bag type dust collector.
Background
A bag filter is a dry dust filter that is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of woven filter cloth or non-woven felt, the dust-containing gas is filtered by the filtering action of the fiber fabric, after the dust-containing gas enters the bag type dust collector, dust with large particles and large specific gravity falls into the dust hopper due to the sedimentation of the gravity, and the dust is blocked when the gas containing fine dust passes through the filter bag, so that the gas is purified.
In order to ensure the dust removal effect and avoid the filter bag from being natural due to heat accumulation, the filter bag needs to be cleaned. At present, the ash removal is mainly carried out by adopting a mode of regularly cleaning ash, for example, gas is blown once every 5 minutes, the ash removal is carried out, if the interval time is improperly set, the over-spraying or under-spraying condition can be caused, namely, when the interval time is set to be smaller, the damage of a filter bag can be caused by frequent blowing, and the service life of the filter bag is shortened. When the interval time is set to be longer, dust deposition generated on the filter bag cannot be removed in time, so that heat accumulation of the filter bag is caused, and the hidden danger of spontaneous combustion exists.
In summary, how to perform ash removal on a filter bag of a bag type dust collector to avoid the situation of excessive ash removal or insufficient ash removal is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a dust cleaning method of a bag type dust collector, which is used for avoiding the situation of excessive dust cleaning or insufficient dust cleaning. Another object of the present invention is to provide a dust removing device of a bag type dust collector.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for cleaning ash of a bag type dust collector comprises the following steps:
detecting the flue gas inlet pipe pressure and the flue gas outlet pipe pressure of the bag type dust collector and the frequency of an induced draft fan;
determining a dust cleaning stopping differential pressure range and a dust cleaning starting differential pressure range according to the frequency of the induced draft fan;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the range of the ash removal stopping pressure difference, stopping ash removal; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, ash removal is started;
the induced draft fan is arranged on a flue gas outlet pipe of the bag type dust collector, and the upper limit value of the ash removal stopping differential pressure range is smaller than the lower limit value of the ash removal starting differential pressure range.
Preferably, the frequency of the induced draft fan has at least one frequency interval, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range correspond to the frequency intervals one to one.
Preferably, the number of the frequency intervals is at least two, and any two frequency intervals have no intersection;
the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
Preferably, under the same frequency of the induced draft fan, the determined ash removal stopping differential pressure range is smaller than a first set value, the obtained ash removal starting differential pressure range is larger than a second set value, and the first set value is smaller than the second set value.
Preferably, the step of starting ash removal specifically comprises: and starting the injection module to inject gas into a filter bag of the bag type dust collector to clean the dust.
Preferably, the ash cleaning process also comprises the following steps:
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, controlling the blowing module to blow at the minimum blowing pressure;
and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, controlling the blowing module to blow at the maximum blowing pressure.
Preferably, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the blowing pressure of the blowing module is controlled to be in a linear relation with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure.
Preferably, the blowing module comprises at least two blowing units which are sequentially sequenced, and any two blowing units are used for blowing gas to different filter bags;
the step of starting the ash removal specifically comprises the following steps:
and controlling the blowing units in the front sequence to blow, and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the ash removal stopping pressure difference range after the blowing of the blowing units in the front sequence is performed for a set time, controlling the blowing units in the back sequence to blow.
Preferably, the filter bags in the bag type dust collector are divided into a first filter bag group and a second filter bag group, the first filter bag group is close to the flue gas inlet of the bag type dust collector, and the second filter bag group is far away from the flue gas inlet of the bag type dust collector;
the blowing module comprises at least two blowing units, all the blowing units are divided into a first blowing unit for blowing the first filter bag group and a second blowing unit for blowing the second filter bag group, and the blowing opening of the first blowing unit is larger than the blowing opening of the second blowing unit.
According to the ash removal method of the bag type dust collector, the ash removal is stopped by reducing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal stopping pressure difference range, and the ash removal is started by increasing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal starting pressure difference range, and as the ash deposition condition of a filter bag can be reflected by the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, the condition of excessive ash removal or insufficient ash removal is effectively avoided; and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are associated with the frequency of the induced draft fan, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are determined under the frequency of the induced draft fan, so that the accuracy of the ash removal stopping differential pressure range and the ash removal starting differential pressure range is improved, the ash removal effect is improved, and the condition of excessive ash removal or insufficient ash removal is further avoided.
Based on the above provided ash removal method for the bag type dust collector, the invention also provides an ash removal device for the bag type dust collector, which comprises the following steps:
the first detector is used for detecting the pressure of the flue gas inlet pipe of the bag type dust collector;
the second detector is used for detecting the pressure of a flue gas outlet pipe of the bag type dust collector;
the third detector is used for detecting the frequency of the induced draft fan;
the determining module is used for determining the ash removal stopping differential pressure range and the ash removal starting differential pressure range according to the frequency of the induced draft fan;
the ash cleaning module is used for cleaning accumulated ash on a filter bag in the bag type dust collector;
the first control module is used for controlling the ash removal module to stop removing ash if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping pressure difference range; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, the first control module is used for controlling the ash removal module to start;
the induced draft fan is arranged on the flue gas outlet pipe, and the upper limit value of the ash removal stopping pressure difference interval is smaller than the lower limit value of the ash removal starting pressure difference interval.
Preferably, the determining module comprises:
the storage unit is used for storing the frequency of the induced draft fan, and the corresponding ash removal stopping differential pressure range and the corresponding ash removal starting differential pressure range under the frequency of the induced draft fan;
and the acquisition unit is used for acquiring the ash removal stopping differential pressure range and the ash removal starting differential pressure range from the storage unit according to the frequency of the induced draft fan.
Preferably, the storage unit stores the frequency of the induced draft fan in a frequency interval mode, the number of the frequency intervals is at least one, and the ash cleaning stopping differential pressure range and the ash cleaning starting differential pressure range correspond to the frequency intervals one by one.
Preferably, the number of the frequency intervals is at least two, and any two frequency intervals have no intersection;
the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
Preferably, under the same frequency of the induced draft fan, the ash removal stopping differential pressure range determined by the determining module is smaller than a first set value, the ash removal starting differential pressure range determined by the determining module is larger than a second set value, and the first set value is smaller than the second set value.
Preferably, the ash removal module is a blowing module for blowing gas to the filter bag to remove ash.
Preferably, the ash removal device of the bag type dust collector further comprises a second control module;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the second control module is used for controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the minimum blowing pressure;
and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the maximum blowing pressure.
Preferably, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the second control module is configured to control the blowing pressure of the blowing module to be in a linear relationship with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure.
Preferably, the blowing module comprises at least two blowing units which are sequentially sequenced, and any two blowing units are used for blowing gas to different filter bags;
the first control module is used for controlling the blowing units which are sequenced in the front to blow, and controlling the blowing units which are sequenced in the back to blow if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the range of the ash removal stopping pressure difference after the blowing units which are sequenced in the front blow for a set time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for cleaning ash in a bag house according to an embodiment of the present invention;
FIG. 2 is a functional relationship diagram of the differential pressure between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure and the blowing pressure in the ash removal method of the bag-type dust collector provided by the embodiment of the invention;
FIG. 3 is a schematic structural diagram of a dust removing device of a bag type dust collector provided by an embodiment of the invention;
fig. 4 is a schematic structural diagram of an ash removal module in an ash removal device of a bag-type dust collector provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the ash removal method for a bag filter provided by the embodiment of the present invention specifically includes the steps of:
s11) detecting the flue gas inlet pipe pressure and the flue gas outlet pipe pressure of the bag type dust collector and the frequency of an induced draft fan:
specifically, the induced draft fan is arranged on a flue gas outlet pipe of the bag type dust collector, the flue gas inlet pipe pressure is the flue gas pressure in the flue gas inlet pipe of the bag type dust collector, and the flue gas outlet pipe pressure is the flue gas pressure in the flue gas outlet pipe of the bag type dust collector. In order to improve the ash removal effect, the pressure of the flue gas outlet pipe is preferably detected at the position, close to the flue gas outlet of the bag type dust collector, of the flue gas outlet pipe, and the pressure of the flue gas outlet pipe is preferably detected at the position, close to the flue gas inlet of the bag type dust collector, of the flue gas inlet pipe.
S12) determining a dust cleaning stopping pressure difference range and a dust cleaning starting pressure difference range according to the frequency of the induced draft fan:
the upper limit value of the ash-cleaning stopping differential pressure range is smaller than the lower limit value of the ash-cleaning starting differential pressure range.
In the practical application process, the corresponding relation between the frequency of the induced draft fan and the ash cleaning stopping differential pressure range and the corresponding relation between the frequency of the induced draft fan and the ash cleaning starting differential pressure range can be found according to experiments, and the ash cleaning stopping differential pressure range and the ash cleaning starting differential pressure range corresponding to the frequency of the induced draft fan are determined before the equipment leaves a factory.
In the practical application process, the determined ash removal stopping differential pressure range is not less than a first set value under the frequency of the same induced draft fan, and the obtained ash removal starting differential pressure range is greater than the first set value. Because the detection pressure and the frequency have delay, in order to avoid influencing the ash removal due to the delay, the determined ash removal stopping differential pressure range is preferably selected to be smaller than a first set value under the frequency of the same induced draft fan, the obtained ash removal starting differential pressure range is larger than a second set value, and the first set value is smaller than the second set value.
Specific values of the first set value and the second set value and a difference between the first set value and the second set value are set according to actual needs, which is not limited in this embodiment.
S13) if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the range of the ash removal stopping pressure difference, stopping ash removal; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure rises to the range of the ash removal starting pressure difference, the ash removal is started:
it should be noted that, the dust deposition condition of the filter bag is known by the pressure difference between the pressure of the flue gas inlet pipe and the pressure of the flue gas outlet pipe, so as to determine whether to start or stop the dust removal. The pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure in the initial state is defaulted to.
According to the ash removal method of the bag type dust collector provided by the embodiment of the invention, ash removal is stopped by reducing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal stopping pressure difference range, and ash removal is started by increasing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal starting pressure difference range, and as the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure can reflect the ash deposition condition of a filter bag, the condition of excessive ash removal or insufficient ash removal is effectively avoided; and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are associated with the frequency of the draught fan, the ash removal stopping differential pressure range and the ash removal starting differential pressure range are determined under the frequency of the draught fan, the accuracy of the ash removal stopping differential pressure range and the ash removal starting differential pressure range is improved, the ash removal effect is improved, the condition of excessive ash removal or insufficient ash removal is further avoided, and efficient ash removal, energy conservation, consumption reduction and material consumption saving are realized.
The ash removal method of the bag type dust collector avoids the condition of excessive ash removal or insufficient ash removal, can avoid the burning of the filter bag due to untimely ash removal, can also avoid the damage of the filter bag due to transitional ash removal, and prolongs the service life of the filter bag.
Because the frequency of the induced draft fan is easy to change, in order to simplify the adjustment, in the dust cleaning method of the bag type dust collector, the frequency of the induced draft fan has at least one frequency interval, and the dust cleaning stopping differential pressure range and the dust cleaning starting differential pressure range are in one-to-one correspondence with the frequency interval.
The number of frequency intervals and the division of the frequency intervals are selected according to actual needs, which is not limited in this embodiment. Preferably, the frequency intervals are at least two, and any two frequency intervals have no intersection; the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
Specifically, the ash removal stopping differential pressure range and the ash removal starting differential pressure range can be determined according to the frequency of the induced draft fan by referring to a table. The pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is recorded as delta P.
Table-condition table for starting and stopping ash cleaning
In the first table, taking the case that Φ is greater than 0 and less than or equal to 15, Δ P is less than or equal to 300, the ash removal device is stopped, Φ is greater than 0 and less than or equal to 15, Δ P is greater than 400, and the ash removal device is started, when the frequency of the induced draft fan is in the frequency range (0, 15), Δ P is less than 300, which is the ash removal stopping differential pressure range, and Δ P is greater than 400, which is the ash removal starting differential pressure range.
In the practical application process, the frequency interval can be selected to be other, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range can be adjusted correspondingly, which is not limited to the table one.
In order to facilitate ash removal, in the ash removal method of the bag type dust collector, the ash removal is started, and the method specifically comprises the following steps: and a blowing module is adopted to blow gas to a filter bag of the bag type dust collector to remove dust. Specifically, the blowing module blows air to the filter bag.
The specific structure of the blowing module is selected according to actual needs, which is not limited in this embodiment.
In order to avoid too low or too high blowing pressure, the blowing pressure is controlled, so that the filter bag is protected. Specifically, the ash cleaning process also comprises the following steps: if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, controlling the injection module to perform injection at the minimum injection pressure; and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, controlling the blowing module to blow at the maximum blowing pressure. As shown in fig. 2, Δ P is the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure.
It should be noted that the upper limit value of the above-mentioned pressure difference range is the maximum pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, and the lower limit value of the above-mentioned pressure difference range is the minimum pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure. The differential pressure range needs to be set according to actual conditions, as shown in table one and fig. 2, the differential pressure range is 400Pa-1000Pa, which is not limited in this embodiment.
If the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is in the pressure difference range, the injection pressure of the injection module is controlled to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, and the injection pressure of the injection module has the maximum value and the minimum value. For example, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is in the pressure difference range, the minimum value of the blowing pressure of the blowing module is 280KPa, and the maximum value of the blowing pressure of the blowing module is 380KPa, 280KPa is the minimum blowing pressure of the blowing module, and 380KPa is the maximum blowing pressure of the blowing module.
Further, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the blowing pressure of the blowing module and the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure are controlled to be in a linear relationship, as shown in fig. 2.
Of course, it is also possible to select that the blowing pressure of the blowing module is controlled to have a curve relationship with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, and the method is not limited to the above embodiment.
According to the dust cleaning method of the bag type dust collector, the filter bag can be effectively protected in the blowing process by controlling the blowing pressure, so that the filter bag is prevented from being blown by continuous high-pressure gas, and blowing according to requirements is realized.
In order to improve the ash removal efficiency, the injection module comprises at least two injection units which are sequentially sequenced, and any two injection units are used for injecting gas to different filter bags; the step of starting the ash removal specifically comprises the following steps: and controlling the blowing unit which is sequenced at the front to blow, and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the range of the ash removal stopping pressure difference after the blowing of the blowing unit which is sequenced at the front is set for time, controlling the blowing unit which is sequenced at the back to blow.
Specifically, taking three injection units as an example, namely an injection unit a, an injection unit b and an injection unit c, firstly controlling the injection unit a to inject, and stopping injecting if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping pressure difference range after the injection unit a injects for a set time; if the pressure difference between the pressure of the flue gas inlet pipe and the pressure of the flue gas outlet pipe does not fall to the ash removal stopping pressure difference range after the blowing unit a blows for the set time, controlling the blowing unit b to blow; if the differential pressure of the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping differential pressure range after the blowing unit b blows for the set time, stopping blowing; and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is not reduced to the range of the ash removal stopping pressure difference after the blowing unit b blows for the set time, controlling the blowing unit c to blow.
The setting time is set according to actual needs, for example, the setting time is 3min, which is not limited in this embodiment.
In practical applications, because of the large number of filter bags in the bag house, the number of blowing units is also large, for example, 128 filter bags, 46 blowing units, and at least three filter bags are blown by each blowing unit. The number of filter bags blown by any two blowing units 46 may be the same or different. In the above method for removing ash in a bag-type dust collector, only one blowing unit is controlled to blow at a time, or only two blowing units are controlled to blow at a time, which is not limited in this embodiment.
According to the dust removing method of the bag type dust collector, the blowing units are controlled to blow in sequence, so that efficient dust removal is realized, the filter bag is protected, and waste of public works such as gas is reduced.
In the blowing module, in order to facilitate the control of the blowing units to sequentially blow and control the blowing pressure of the blowing units, each blowing unit is communicated with an air source through an air transmission branch pipe, the air transmission branch pipe is provided with a regulating valve, the regulating valve can cut off the air transmission branch pipe, can also conduct the air transmission branch pipe and can also regulate the air pressure, and the air transmission branch pipes correspond to the blowing units one to one. For the convenience of control, the regulating valve is an electromagnetic valve.
In the bag type dust collector, the filter bags are divided into a first filter bag group and a second filter bag group, the first filter bag group is close to the flue gas inlet of the bag type dust collector, and the second filter bag group is far away from the flue gas inlet of the bag type dust collector. Generally, the first filter bag set has more dust deposition. In order to improve the ash removal efficiency, the blowing module comprises at least two blowing units, all the blowing units are divided into a first blowing unit for blowing the first filter bag group and a second blowing unit for blowing the second filter bag group, and the blowing opening of the first blowing unit is larger than the blowing opening of the second blowing unit.
A separation pedal is arranged in the shell of the bag type dust collector, the first filter bag group is arranged on one side of the separation pedal, and the second filter bag group is arranged on the other side of the separation pedal. In order to facilitate the gas transmission, the number of the gas sources is two, one gas source is used for providing gas for the first blowing unit, and the other gas source is used for providing gas for the second blowing unit.
Based on the ash removal method of the bag-type dust collector provided by the above embodiment, an embodiment of the present invention further provides an ash removal device of a bag-type dust collector, as shown in fig. 3, the ash removal device of the bag-type dust collector includes: a first detector 300, a second detector 400, a third detector, a determination module, a soot cleaning module 100, and a first control module.
Wherein, the first detector 300 is used for detecting the flue gas inlet pipe pressure of the bag type dust collector; the second detector 400 is used for detecting the pressure of the flue gas outlet pipe of the bag type dust collector; the third detector is used for detecting the frequency of the induced draft fan 240; the determining module is used for determining the ash removal stopping differential pressure range and the ash removal starting differential pressure range according to the frequency of the induced draft fan 240; the ash removal module 100 is used for cleaning the accumulated ash on the filter bag 250 in the bag type dust collector; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping pressure difference range, the first control module is used for controlling the ash removal module 100 to stop removing ash; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, the first control module is used for controlling the ash removal module 100 to start; the induced draft fan 240 is arranged on the flue gas outlet pipe 220, and the upper limit value of the ash removal stopping pressure difference interval is smaller than the lower limit value of the ash removal starting pressure difference interval.
In the ash removal device of the bag type dust collector, the flue gas inlet pipe pressure is the flue gas pressure in the flue gas inlet pipe 210 of the bag type dust collector, and the flue gas outlet pipe pressure is the flue gas pressure in the flue gas outlet pipe 220 of the bag type dust collector. In order to improve the ash removal effect, it is preferable that the first detector 300 is disposed at the position where the flue gas inlet pipe 210 is close to the flue gas inlet of the bag-type dust collector, and the second detector 400 is disposed at the position where the flue gas outlet pipe 220 is close to the flue gas outlet of the bag-type dust collector.
The types of the first detector 300, the second detector 400, and the third detector are selected according to actual needs, and this embodiment does not limit this.
In the practical application process, the corresponding relationship between the frequency of the induced draft fan 240 and the ash cleaning stopping differential pressure range and the corresponding relationship between the frequency of the induced draft fan 240 and the ash cleaning starting differential pressure range can be found according to experiments, and the ash cleaning stopping differential pressure range and the ash cleaning starting differential pressure range corresponding to the frequency of the induced draft fan 240 are determined before the equipment leaves a factory.
In order to facilitate ash removal, the determining module comprises: the device comprises a storage unit and an acquisition unit, wherein the storage unit is used for storing the frequency of the induced draft fan 240, and the corresponding ash removal stopping differential pressure range and the corresponding ash removal starting differential pressure range under the frequency of the induced draft fan 240; the acquisition unit is used for acquiring the ash removal stopping differential pressure range and the ash removal starting differential pressure range from the storage unit according to the frequency of the induced draft fan 240.
It should be noted that the ash deposition condition of the filter bag 250 is obtained by the pressure difference between the pressure of the flue gas inlet pipe and the pressure of the flue gas outlet pipe, so as to determine whether to start or stop ash removal. In the initial state, the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is defaulted to.
According to the ash removal device of the bag type dust collector provided by the embodiment of the invention, ash removal is stopped by reducing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal stopping pressure difference range, and ash removal is started by increasing the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure to the ash removal starting pressure difference range, and as the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure can reflect the ash deposition condition of the filter bag 250, the condition of excessive ash removal or insufficient ash removal is effectively avoided; and moreover, the ash removal stopping differential pressure range and the ash removal starting differential pressure range are both related to the frequency of the draught fan 240, the ash removal stopping differential pressure range and the ash removal starting differential pressure range are determined under the frequency of the draught fan 240, the accuracy of the ash removal stopping differential pressure range and the ash removal starting differential pressure range is improved, the ash removal effect is improved, the situation of excessive ash removal or insufficient ash removal is further avoided, and efficient ash removal, energy saving, consumption reduction and material consumption saving are realized.
The ash removal device of the bag type dust collector avoids the condition of excessive ash removal or insufficient ash removal, can avoid the filter bag 250 from being burnt due to untimely ash removal, can also avoid the filter bag 250 from being damaged due to transitional ash removal, and prolongs the service life of the filter bag 250.
Because the frequency of the induced draft fan 240 is easy to change, in order to simplify the adjustment, the storage unit stores the frequency of the induced draft fan 240 in a frequency interval mode, the frequency interval is at least one, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are in one-to-one correspondence with the frequency interval.
The number of frequency intervals and the division of the frequency intervals are selected according to actual needs, which is not limited in this embodiment. Preferably, the frequency intervals are at least two, and any two frequency intervals have no intersection; the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
Specifically, the ash removal stopping differential pressure range and the ash removal starting differential pressure range can be determined according to the frequency of the induced draft fan 240 by referring to a table. The pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is recorded as delta P.
Table-condition table for starting and stopping ash cleaning
In the first table, taking the case where Φ is greater than 0 and less than or equal to 15, Δ P is less than or equal to 300, the ash removal device is stopped, Φ is greater than 0 and less than or equal to 15, Δ P is greater than 400, and the ash removal device is started, when the frequency of the induced draft fan 240 is in the frequency range (0, 15), Δ P is less than 300, which is the ash removal stopping differential pressure range, and Δ P is greater than 400, which is the ash removal starting differential pressure range.
In the practical application process, the frequency interval can be selected to be other, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range can be adjusted correspondingly, which is not limited to the table one.
In the practical application process, the determined ash removal stopping differential pressure range is not less than the first set value and the obtained ash removal starting differential pressure range is greater than the first set value under the same frequency of the induced draft fan 240. Because the detection pressure and the frequency have delay, in order to avoid the influence on the ash removal due to the delay, the determined ash removal stopping differential pressure range is preferably selected to be smaller than a first set value under the frequency of the same induced draft fan 240, the obtained ash removal starting differential pressure range is larger than a second set value, and the first set value is smaller than the second set value.
Specific values of the first set value and the second set value and a difference between the first set value and the second set value are set according to actual needs, which is not limited in this embodiment.
In order to facilitate the dust removal, the dust removal module 100 is a blowing module for blowing gas to the filter bag 250 to remove dust. Specifically, the blowing module blows air to the filter bag 250. The air is high pressure air.
The specific structure of the blowing module is selected according to actual needs, which is not limited in this embodiment.
In order to avoid too low or too high a blowing pressure, the blowing pressure is controlled so as to protect the filter bag 250. Preferably, the ash removal device of the bag-type dust collector further comprises a second control module.
Specifically, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the second control module is used for controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the minimum blowing pressure; and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the maximum blowing pressure. As shown in fig. 2, Δ P is the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure.
It should be noted that the upper limit value of the above-mentioned pressure difference range is the maximum pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, and the lower limit value of the above-mentioned pressure difference range is the minimum pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure. The differential pressure range needs to be set according to actual conditions, as shown in table one and fig. 2, the differential pressure range is 400Pa-1000Pa, which is not limited in this embodiment.
If the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is in the pressure difference range, the injection pressure of the injection module is controlled to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, and the injection pressure of the injection module has the maximum value and the minimum value. For example, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is in the pressure difference range, the minimum value of the blowing pressure of the blowing module is 280KPa, and the maximum value of the blowing pressure of the blowing module is 380KPa, 280KPa is the minimum blowing pressure of the blowing module, and 380KPa is the maximum blowing pressure of the blowing module.
Further, if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the second control module is configured to control the blowing pressure of the blowing module to be in a linear relationship with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure, as shown in fig. 2.
Of course, it is also possible to select that the blowing pressure of the blowing module is controlled to have a curve relationship with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, and the method is not limited to the above embodiment.
In the ash removal device of the bag type dust collector, the blowing pressure is controlled by the second control module, so that the filter bag 250 can be effectively protected in the blowing process, the filter bag 250 is prevented from being blown by continuous high-pressure gas, and blowing as required is realized.
In order to improve the ash removal efficiency, the injection module comprises at least two injection units which are sequentially sequenced, and any two injection units are used for injecting gas to different filter bags 250; the first control module is used for controlling the blowing units which are sequenced in the front to blow, and controlling the blowing units which are sequenced in the back to blow if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the range of the ash removal stopping pressure difference after the blowing of the blowing units which are sequenced in the front is set for time.
Specifically, taking three injection units as an example, namely an injection unit a, an injection unit b and an injection unit c, firstly controlling the injection unit a to inject, and stopping injecting if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping pressure difference range after the injection unit a injects for a set time; if the pressure difference between the pressure of the flue gas inlet pipe and the pressure of the flue gas outlet pipe does not fall to the ash removal stopping pressure difference range after the blowing unit a blows for the set time, controlling the blowing unit b to blow; if the differential pressure of the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping differential pressure range after the blowing unit b blows for the set time, stopping blowing; and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is not reduced to the range of the ash removal stopping pressure difference after the blowing unit b blows for the set time, controlling the blowing unit c to blow.
The setting time is set according to actual needs, for example, the setting time is 3min, which is not limited in this embodiment.
In practical applications, because there are more filter bags 250 in the bag house, the number of the blowing units is also larger, for example, 128 filter bags 250, 46 blowing units, and at least three filter bags 250 are blown by each blowing unit, as shown in fig. 4. The number of filter bags 250 blown by any two blowing units 46 may be the same or different. In the ash removal device of the bag-type dust collector, the first control module controls only one blowing unit to blow at a time, or controls only two blowing units to blow at a time, which is not limited in this embodiment.
The ash removal device of the bag type dust collector realizes efficient ash removal, protects the filter bag 250 and reduces waste of public works such as gas and the like by controlling the injection units to inject in sequence.
In the above blowing module, in order to facilitate the control of the sequential blowing of the blowing units and the control of the blowing pressure of the blowing units, each blowing unit is communicated with the air source 130 through the air delivery branch pipe 120, and the air delivery branch pipe 120 is provided with the regulating valve 110, the regulating valve 110 can cut off the air delivery branch pipe 120, can also conduct the air delivery branch pipe 120, and can also regulate the air pressure, and the air delivery branch pipes 120 correspond to the blowing units one to one. For the convenience of control, the regulating valve 110 is a solenoid valve. The first control module controls the blowing unit to blow by controlling the opening and closing of the electromagnetic valve, and the second control module controls the blowing pressure of the blowing unit by controlling the opening of the electromagnetic valve.
In the above-mentioned bag collector, the filter bag 250 is divided into a first filter bag group and a second filter bag group, the first filter bag group is close to the flue gas inlet of the bag collector, and the second filter bag group is far away from the flue gas inlet of the bag collector. Generally, the first filter bag set has more dust deposition. In order to improve the ash removal efficiency, the blowing module comprises at least two blowing units, all the blowing units are divided into a first blowing unit for blowing the first filter bag group and a second blowing unit for blowing the second filter bag group, and the blowing opening of the first blowing unit is larger than the blowing opening of the second blowing unit.
A separation pedal 260 is arranged in the shell of the bag type dust collector, a first filter bag group is arranged on one side of the separation pedal 260, and a second filter bag group is arranged on the other side of the separation pedal 260. To facilitate gas delivery, the gas sources 130 are two, one gas source 130 is used to provide gas to the first blowing unit, and the other gas source 130 is used to provide gas to the second blowing unit.
The type of the bag filter is selected according to actual needs, for example, the bag filter is a low-pressure off-line long bag pulse bag filter, which is not limited in this embodiment.
As shown in fig. 1, the flue gas before purification is introduced into the flue gas inlet pipe 210 via the guide plate to make the inlet air volume uniform, then enters the ash hoppers of each chamber via the air inlet regulating valve, the coarse dust particles settle to the bottom of the ash hoppers, the fine dust particles turn upwards along with the air flow to enter the filter chamber, the dust is blocked on the surface of the filter bag 250, the purified flue gas enters the cleaning chamber via the filter bag port, is discharged via the flue gas outlet pipe 220, then is pumped to the chimney via the induced draft fan 240, and is discharged to the atmosphere via the chimney; the ash in the ash hopper is discharged out of the ash discharge pipe 230.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (18)
1. The ash cleaning method of the bag type dust collector is characterized by comprising the following steps:
detecting the flue gas inlet pipe pressure and the flue gas outlet pipe pressure of the bag type dust collector and the frequency of an induced draft fan;
determining a dust cleaning stopping differential pressure range and a dust cleaning starting differential pressure range according to the frequency of the induced draft fan;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the range of the ash removal stopping pressure difference, stopping ash removal; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, ash removal is started;
the induced draft fan is arranged on a flue gas outlet pipe of the bag type dust collector, and the upper limit value of the ash removal stopping differential pressure range is smaller than the lower limit value of the ash removal starting differential pressure range.
2. The method of removing ash of claim 1,
the frequency of the induced draft fan is provided with at least one frequency interval, and the ash removal stopping differential pressure range and the ash removal starting differential pressure range are in one-to-one correspondence with the frequency intervals.
3. The method of claim 2, wherein the frequency bins are at least two, and any two of the frequency bins do not intersect;
the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
4. The ash removal method according to claim 1, wherein the determined ash removal stopping differential pressure range is smaller than a first set value, the obtained ash removal starting differential pressure range is larger than a second set value, and the first set value is smaller than the second set value under the same frequency of the induced draft fan.
5. The ash removal method according to any one of claims 1 to 4, wherein the step of initiating ash removal is specifically: and starting the injection module to inject gas into a filter bag of the bag type dust collector to clean the dust.
6. The method of removing ash of claim 5, further comprising the steps of:
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, controlling the blowing module to blow at the minimum blowing pressure;
and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, controlling the blowing module to blow at the maximum blowing pressure.
7. The method for removing ash of claim 6 wherein if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the range of the pressure difference, the injection pressure of the injection module is controlled to be in a linear relation with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure.
8. The method for removing ash of claim 5, wherein the blowing module comprises at least two blowing units which are sequentially arranged, and any two blowing units are used for blowing gas to different filter bags;
the step of starting the ash removal specifically comprises the following steps:
and controlling the blowing units in the front sequence to blow, and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the ash removal stopping pressure difference range after the blowing of the blowing units in the front sequence is performed for a set time, controlling the blowing units in the back sequence to blow.
9. The method of removing ash of claim 5,
the filter bags in the bag type dust collector are divided into a first filter bag group and a second filter bag group, the first filter bag group is close to the smoke inlet of the bag type dust collector, and the second filter bag group is far away from the smoke inlet of the bag type dust collector;
the blowing module comprises at least two blowing units, all the blowing units are divided into a first blowing unit for blowing the first filter bag group and a second blowing unit for blowing the second filter bag group, and the blowing opening of the first blowing unit is larger than the blowing opening of the second blowing unit.
10. An ash removal device for a bag type dust collector, comprising:
the first detector is used for detecting the pressure of the flue gas inlet pipe of the bag type dust collector;
the second detector is used for detecting the pressure of a flue gas outlet pipe of the bag type dust collector;
the third detector is used for detecting the frequency of the induced draft fan;
the determining module is used for determining the ash removal stopping differential pressure range and the ash removal starting differential pressure range according to the frequency of the induced draft fan;
the ash cleaning module is used for cleaning accumulated ash on a filter bag in the bag type dust collector;
the first control module is used for controlling the ash removal module to stop removing ash if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is reduced to the ash removal stopping pressure difference range; if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is increased to the range of the ash removal starting pressure difference, the first control module is used for controlling the ash removal module to start;
the induced draft fan is arranged on the flue gas outlet pipe, and the upper limit value of the ash removal stopping pressure difference interval is smaller than the lower limit value of the ash removal starting pressure difference interval.
11. The ash removal device of claim 10, wherein the determination module comprises:
the storage unit is used for storing the frequency of the induced draft fan, and the corresponding ash removal stopping differential pressure range and the corresponding ash removal starting differential pressure range under the frequency of the induced draft fan;
and the acquisition unit is used for acquiring the ash removal stopping differential pressure range and the ash removal starting differential pressure range from the storage unit according to the frequency of the induced draft fan.
12. The ash removal device of claim 11,
the storage unit stores the frequency of the induced draft fan in a frequency interval mode, the number of the frequency intervals is at least one, and the ash cleaning stopping differential pressure range and the ash cleaning starting differential pressure range correspond to the frequency intervals one by one.
13. The ash removal device of claim 12,
the number of the frequency intervals is at least two, and any two frequency intervals have no intersection;
the upper limit value of the ash-cleaning stopping differential pressure range and the lower limit value of the ash-cleaning starting differential pressure range are positively correlated with the upper limit value of the frequency interval.
14. The ash removal device of claim 10, wherein the ash removal stopping differential pressure range determined by the determination module is smaller than a first set value, the ash removal starting differential pressure range determined by the determination module is larger than a second set value, and the first set value is smaller than the second set value under the same frequency of the induced draft fan.
15. The ash removal device of any one of claims 10-14, wherein the ash removal module is a blowing module for blowing gas to the filter bag to remove ash.
16. The ash removal device of claim 15, further comprising a second control module;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range, the second control module is used for controlling the blowing pressure of the blowing module to be positively correlated with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure;
if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is smaller than the lower limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the minimum blowing pressure;
and if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is larger than the upper limit value of the pressure difference range, the second control module is used for controlling the blowing module to blow at the maximum blowing pressure.
17. The ash removal method of claim 16, wherein the second control module is configured to control the blowing pressure of the blowing module to be in a linear relationship with the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure is within the pressure difference range.
18. The method for removing ash of claim 15, wherein the blowing module comprises at least two blowing units which are sequentially arranged, and any two blowing units are used for blowing gas to different filter bags;
the first control module is used for controlling the blowing units which are sequenced in the front to blow, and controlling the blowing units which are sequenced in the back to blow if the pressure difference between the flue gas inlet pipe pressure and the flue gas outlet pipe pressure does not fall to the range of the ash removal stopping pressure difference after the blowing units which are sequenced in the front blow for a set time.
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| CN202011116248.6A CN112121550A (en) | 2020-10-19 | 2020-10-19 | Dust cleaning method and device for bag type dust collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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